Friday, July 6, 2012

A cutting edge street art project by international artist Ernest Zacharevic, the project consists of six to 12 mural paintings created on the walls of buildings within the Georgetown heritage area. The paintings will depict figure drawings and portraits of various inhabitants of the city celebrating the multiculturalism and diversity of the town.

All photos above are courtesy of Ernest Zacharevic and Penang traveltips site

Sunday, July 1, 2012

Electromagnetic induction is the production of induced current by changing magnetic field. By using kinetic energy of shaking hand, electrical energy is produced to power the flash light through electromagnetic induction.

Kinetic energy ------> Electrical energy

A powerful permanent magnet such as neodymium magnet is used because of small size with strong magnetic field. The permanent magnet is placed inside a plastic track which allow it to slide up and down.

The shaking hands move the strong magnet to cut through the copper coils causing electromagnetic induction.

The electrical energy produced is stored in a capacitor that can be charged hundreds of thousands times.

The bulb is an energy efficient ultra bright white LED that can produce a beam of light for several minutes after shaking the moving magnet for 30 seconds.

In a voltaic cell, two different metals are used to create a potential difference. A higher metal in the electrochemical series ...

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The Power of Teachers

"Any nation is as great, as good, as its citizens make it........It is teachers more than any other single group of people who determine attitudes, and who shape the ideas and aspirations of the nation." Julius Nyerere, 1966